高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (11): 2240.

• 研究论文 • 上一篇    下一篇

整体式Mn-Fe/ZrO2-TiO2催化剂的制备及在低温NH3-SCR反应中的性能

林涛, 徐海迪, 李伟, 张秋林, 龚茂初, 陈耀强   

  1. 四川大学化学学院, 绿色化学与技术教育部重点实验室, 成都 610064
  • 收稿日期:2009-01-05 出版日期:2009-11-10 发布日期:2009-11-10
  • 通讯作者: 陈耀强, 男, 博士, 教授, 博士生导师, 主要从事催化化学和催化材料研究. E-mail: nic7501@scu.edu.cn
  • 基金资助:

    国家自然科学重点基金(批准号: 20333030)和国家自然科学基金(批准号: 20273043)资助.

Preparation of Mn-Fe/ZrO2-TiO2 Monolith Catalyst and Its Properties for Low-Temperature NH3-SCR Reaction

LIN Tao, XU Hai-Di, LI Wei, ZHANG Qiu-Lin, GONG Mao-Chu, CHEN Yao-Qiang*   

  1. Key Laboratory of Green Chemistry & Technology, Ministry of Education, Sichuan University, Chengdu 610064, China
  • Received:2009-01-05 Online:2009-11-10 Published:2009-11-10
  • Contact: CHEN Yao-Qiang. E-mail: nic7501@scu.edu.cn
  • Supported by:

    国家自然科学重点基金(批准号: 20333030)和国家自然科学基金(批准号: 20273043)资助.

摘要:

以锆钛复合氧化物为载体, 制备整体式Mn基催化剂并研究其在低温氨选择性催化还原(NH3-SCR)氮氧化物反应中的性能; 用BET、XRD、储氧量(OSC)、程序升温还原(TPR)和XPS对催化剂进行表征. 实验结果表明, 与以TiO2为载体的催化剂相比, 以ZrO2-TiO2为载体的催化剂具有较大的比表面积、更稳定的晶相结构和较多的储氧量, 并具有较强的低温氧化性能和较高的表面Mn含量, 表现出良好的低温活性和高温稳定性. 在700 ℃焙烧后, Mn-Fe/ZrO2-TiO2在高空速55000 h-1条件下, 仍具有较好的起燃温度(182 ℃)和NO的转化率(78%), 并具有较强的抗水性能, 表现出很好的应用前景.

关键词: 低温NH3-SCR反应; 锆钛复合氧化物; 氮氧化物; 整体式催化剂

Abstract:

The catalytic properties of the monolith ZrO2-TiO2 supported Mn-based catalysts were studied for NH3-SCR reaction at low temperature. The catalysts were characterized by specific surface area measurements(BET), X-ray diffraction(XRD), oxygen storage capacity(OSC) , temperature programmed reduction(TPR) and X-ray photoelectron spectroscopy(XPS). The results indicate that, compared to the catalysts supported on TiO2 ,the catalysts supported on ZrO2-TiO2 have higher surface area, more steady structure, more OSC, stronger redox properties as well as higher concentration of surface Mn and have good activity at low temperature and excellent stability at high temperature. After Mn-Fe/ZrO2-TiO2 is calcined at 700 ℃, the light-off tempe-rature of the catalyst is 182 ℃ and NO conversion is 78% at a high space velocity of 55000 h-1, and the catalyst is water-resistant. It shows great potential for practical application.

Key words: Low-temperature NH3-SCR reaction; ZrO2-TiO2; NOx; Monolith catalyst

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